it seems to emulate the sound really well for the MZ-80 machines (not tried MZ-700). Like most of the MZ emulators the timing is not perfect though. For instance my Z80 interrupt routines to make changes to the screen needs to be adjusted quite a lot to work at all.

Anyone aware of any other emulators? (other than Multisystem which doesn't seem as good as the above)

I bought a MiSTer (Terassic DE10-nano). One day, I'll retrieve MZ cores and check them. I think there is an MZ-80 A core done with a DE FPGA, but it may need some adjustments. Not sure if FPGA implementation of MZ can be fit in emulator category though.